US 2014/0152582 A1 · NOISE CORRECTION FOR STYLUS APPLICATIONS ON TABLETS AND OTHER TOUCH DEVICES

Abstract

A touch sensitive device capable of detecting signals generated by a stylus and correcting the detected stylus signals for effects due to noise present on the device is disclosed. In one example, signals are taken from one or more electrodes that are a pre-determined distance away from an electrode in which a stylus signal is detected. The pre-determined distance can be empirically determined such that a noise estimate can be generated such that the electrodes have a higher probability of containing only noise that is highly correlated to the noise present on a detected stylus signal. The generated noise estimate is then subtracted from a detected stylus signal to reduce the effect of noise on the stylus signal.

Claims24

Dependent claims

A stylus detection apparatus for detecting contacts from a stylus, the apparatus comprising:

a touch sensor panel comprising a plurality of electrodes, each electrode configured to receive one or more signals from a stylus;
and
a processor, the processor capable of:
measuring a first signal from a first electrode;
measuring one or more signals from a pre-determined number of second electrodes;
generating a noise estimate based on the measured one or more signals from the pre-determined number of second electrodes;
and
adjusting the measured first signal based on at least the generated noise estimate.

5 more elements

Dependencies are inferred from the claim text.

Noise correction for stylus applications on tablets and other touch devices

Life of this patent

Noise correction for stylus applications on tablets and other touch devices

Life of this patent

Abstract

Claims24